begin的現在分詞和過去式是什么

　　begin例句

　　The project is beginning to show results.

　　這項工程開始顯出成效。

　　I was beginning to think you'd never come.

　　我開始以為你是不會來了。

　　The pressure of work is beginning to get to him.

　　工作的壓力使他煩惱起來。

　　We began work on the project in May.

　　我們于五月份啟動了這項工程。